ASoC: amd: acp5x-mach:add checks to avoid static analysis warnings

ASoC: amd: acp5x-mach:add checks to avoid static analysis warnings

snd_soc_card_get_codec_dai() can return NULL, but that value is not
checked for, leading to static analysis warnings.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
Reviewed-by: Yaochun Hung <yc.hung@mediatek.com>
Link: https://lore.kernel.org/r/20230731213748.440285-9-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>